//prioritize digits at digit depth
private Digit[] orderDigits(int depth)
{
Digit[] d = new Digit[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
BigInteger[] products = new BigInteger[10];
BigInteger[] ordered = new BigInteger[10];
for(int i = 0; i < 10; i++)
{
index[depth] = (Byte)d[i];
setNums(depth);
products[i] = nums[0].Value * nums[1].Value;
}
for (int i = 0; i < 10; i++)
ordered[i] = products[i];
Array.Sort(ordered);
for (int i = 0; i < 10; i++)
{
for(int j = 0; j < 10; j++)
{
if (products[i] == ordered[j])
d[i] = j;
}
}
return d;
}
public void addDigit(Digit d)
{
if (num == 0)//if value is empty
{
num = d.Value;//then set single digit value
dig = 1;//set single digit counter
return;//exit function
}
//if digits list doesn't have enough digits
if (digits.Count + 1 <= dig)
digits.Add(digits[dig - 2] * 10);
num += digits[dig - 1] * d.Value;
dig++;
}
public static Pair[] genFirstRoots(Digit d)
{
//create array of root arrays
Pair[][] roots = new Pair[][] {
new Pair[] { new Pair(1,1), new Pair(3,7), new Pair(9,9)}, //produce 1 in ones digit
new Pair[] { new Pair(1,3), new Pair(7,9)}, //produce 3 in ones digit
new Pair[] { new Pair(1,7) , new Pair(3,9)}, //produce 7 in ones digit
new Pair[] { new Pair(1,9) , new Pair(3,3), new Pair(7,7)}}; // produce 9 in ones digit
switch (d.Value)
{
case 1: //if ones digit is 1
return roots[0];
case 3: //if ones digit is 3
return roots[1];
case 7: //if ones digit is 7
return roots[2];
case 9: //if ones digit is 9
return roots[3];
default: //else return defualt
return null;
}
}
public Pair(int x = 0, int y = 0)
{
this.x = new Digit(x);
this.y = new Digit(y);
}
public Pair[] getPA(int branch, Digit d)
{
return toPair(nums[branch][d.Value]);
}
//generate roots based on Digit provided
public PairGenerator(Digit d)
{
roots = genFirstRoots(d);
setup(d, out this.branches);
}
private void setup(Digit d, out int branches)
{
switch (d.Value)
{
case 1:
nums = make1();
branches = 3;
break;
case 3:
nums = make3();
branches = 2;
break;
case 7:
nums = make7();
branches = 2;
break;
default:
nums = make9();
branches = 3;
break;
}
}
//set value at this digit
public void setDigit(Digit d, int index)
{
if (index >= 1)//make sure index is in range
{
Digit atIndex = new Digit();
setDigitsList(index);//make sure Digits list is long enough
if (dig >= index)
{
atIndex.set(num, index);
if (atIndex.Value != 0)//if digit at index is not 0
removeDigit(index);//then set to 0
}
num += (digits[index - 1]) * d.Value;//add digit to num at specified index
}
}